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In page Tesla turbine:

"

In standard steam turbines, the steam must press on the blades for the rotor to extract energy from the steam; the blades must be carefully oriented to minimize the angle of attack to the blade surface area. In other words, in the optimal regime, the orientation of the blades minimizes the angle (blade pitch) with which the steam is hitting their surface area, to create smooth steam flow and to minimize turbulence. This turbulence reduces the amount of useful energy that can be extracted from the incoming steam flow.[citation needed]